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A new study of 2,500+ men found that eating more animal protein — especially dairy — was linked to lower testosterone, while plant protein was associated with higher levels. The differences were small and causation hasn't been proven, but the findings add a fresh angle to the diet-hormone conversation. Researchers say it's not yet clear whether changing protein choices would directly impact men's hormonal health.
A new study from the University of Eastern Finland found that the type of protein men eat — not just how much — may be linked to their testosterone levels. Among 2,546 middle-aged men, those with the highest animal protein intake had testosterone levels averaging 1.2 nmol/l lower than those with the lowest intake. Plant protein showed the opposite trend, with high consumers averaging 1.1 nmol/l higher. Similar patterns held for sex hormone-binding globulin (SHBG), a key regulator of circulating testosterone.
Drilling down further, dairy protein was the standout on the animal side, linked to lower levels of both testosterone and SHBG. Plant proteins from vegetables (non-cereal sources) were associated with higher testosterone. Meat protein, interestingly, was tied to lower SHBG but not total testosterone levels.
By the Numbers:
Why it matters: While the differences are modest and causation remains unproven, this research encourages clinicians and patients to think beyond how much protein they consume to where it comes from — particularly relevant for men managing hormonal health.
